Guarding against injury means increasing both flexibility and strength. Target the muscles that support your ankles to protect your joints by strength-training two or three times a week on alternating days and always after you've warmed up.
All that slipping and sliding on tennis courts prevents injuries: A biomechanics expert explains how
Evidence has been available for decades to suggest that players have fewer knee problems if they play on clay courts rather than hard surfaces over their careers.
Physical therapy helps people recover from sports injuries, but it also can help prevent them, an expert says.
While it will do some damage to your bank account, you need a sport-specific pair of shoes for any activity you do more than three times a week. Otherwise you risk injury and may hamper your performance.